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The paper contains a presentation of new approaches to solving the problem of identifying critical infrastructure elements in the railway sub-sector. The research objective was to analyse the procedures which are used to identify the potential elements of critical infrastructure in the transportation sector. Specific attention is paid to criteria of methods developed in Germany, the Czech Republic and Slovakia. The objective of the work is based on the analysis of the current state of art. The research also attempted to design an effective methodology which allows assessing the significance of rail infrastructure elements. The developed methodology should help to set a group of potential elements of critical infrastructure in the railway sub-sector. [ABSTRACT FROM AUTHOR]

Abstract: The present paper addresses the issue of urban sprawl in Europe from a multidimensional point of view, identifying the most sprawled areas and characterizing them in terms of population size. The literature is reviewed to categorize and extract the most relevant six dimensions that define the concept and several indices are specified to implement them. These are then calculated for a sample of the main European cities that uses several sources to obtain the best possible dataset to measure urban sprawl. All this information is brought together using the self-organizing map (SOM) algorithm to be visualized and further studied, taking advantage of its properties as a data-reduction as well as a clustering technique. The analysis locates the hot-spots of urban sprawl in Europe in the centre of the continent, around Germany, and characterizes such urban areas as small, always half the size of the average city of the sample. [Copyright &y& Elsevier]

Summary: Heracleum mantegazzianum Somm. et Lev. is an invasive tall forb in Europe with implications for human health (photo-dermatitis), recreational and economic interests, and local biodiversity. This paper presents invasion patterns of the species in Germany on the regional and landscape scales and assesses the species’ impacts on native habitats. We conducted a survey addressing the nature conservation authorities of all 440 German districts and carried out our own field studies in the most heavily invaded landscapes in Germany. The survey indicated that H. mantegazzianum is present and perceived as a potentially dangerous invader in about two-thirds of German districts, while actual or short-term hazards can be assumed for only about 15% of districts. The latter were concentrated in the natural geographic region ‘western low mountain ranges’. In the field studies, dominant stands of H. mantegazzianum, which bear the highest potential for adverse effects on native biodiversity, accounted for 36% of all large stands of the species. Invasion success was highest in abandoned grasslands, grassland and field margins, and corresponding tall-forb stands. The saturation (% area covered) of these preferred habitats with H. mantegazzianum was 8.7%. The invasion percentage (% area invaded) was 18.5%. In conclusion, our results suggest that today H. mantegazzianum has only moderate impacts on the regional and landscape scales even in most heavily invaded regions of Germany. [Copyright &y& Elsevier]

The Hopper, a concept for a reusable launch system was developed and found attractive in the frame of FESTIP, ESA''s Furure European Space Transportation Initiation Programme Later, in the national German ASTRA programme this concept was adapted to newly emerged requirement and subjected to a detailed design loop. Taking off horizontally and staging at high sub-orbital velocity, the Hopper needs a rail-guided launch sled, downrange landing, re-transportation back to the launch site, and one, but only one upper stage. Horizontal take-off is used to improve safety and to reduce thrust requirement, and number, mass, and cost of main engines, and also problems with vehicle centering. Transportang of the cargo (e.g.) payload and expendable upper stage) in the RLV results in only one aerodynamically affected flight configuration. Staging at high sub-orbital velocity above the sensible atmosphere enables the use of only one standardised upper stage for all missions. Using a cryogenic upper stage the Hopper system is nearly optimally staged for the dimensioning GTO mission. The paper describes the consolidated unmaanned RLV concept and highlights areas of special interest, evolution potential, and further steps. [Copyright &y& Elsevier]

• A new retrofitting strategy by using prefabricated elements window machine. • Minimization of the renovation costs and speeding up the retrofit action. • A potential in energy saving and improving the Indoor Environment Quality. • Further significance in retrofit and healthy home office working environments. The renovation of existing residential buildings across Europe has become a key factor for energy saving and the improvement of Indoor Environment Quality (IEQ). This paper presents an investigation of IEQ for a typical 1960s single-family house in Germany before and after a new retrofitting strategy (prefabricated element with integrated ventilation and new thermal envelope). In-situ measurements were applied to investigate the energy efficiency and IEQ improvement for the new retrofitting strategy in temperate winter regions of Europe. The simulation model replicates the measured data to be closer to reality and simulates a home office (COVID-19) scenario. The in-situ measurements showed that our retrofitting strategy increases the indoor air temperature during the heating period by up to 2.5 °C, decreases relative humidity by up to 3.8% and increases CO 2 by up to 24 ppm than before. As the simulation results shows, the retrofitted home office scenario allows a reduction in heating energy of up to 77%, an increase in CO 2 concentration of up to 41.8 ppm, 0.5% less relative humidity and 1.6 °C higher indoor air temperature than that without retrofitting. The new approach to retrofit residential buildings thus showed a potential in energy saving and improving the IEQ. [ABSTRACT FROM AUTHOR]

When COVID-19 pandemic spread in Europe, governments imposed unprecedented confinement measures with mostly unknown repercussions on contemporary societies. In some cases, a considerable drop in energy consumption was observed, anticipating a scenario of sizable low-cost energy generation, from renewable sources, expected only for years later. In this paper, the impact of governmental restrictions on electrical load, generation and transmission was investigated in 16 European countries. Using the indices provided by the Oxford COVID-19 Government Response Tracker, precise restriction types were found to correlate with the load drop. Then the European grid was analysed to assess how the load drop was balanced by the change in generation and transmission patterns. The same restriction period from 2020 was compared to previous years, accounting for yearly variability with ad hoc statistical technique. As a result, generation was found to be heavily impacted in most countries with significant load drop. Overall, generation from nuclear, and fossil coal and gas sources was reduced, in favour of renewables and, in some countries, fossil gas. Moreover, intermittent renewables generation increased in most countries without indicating an exceptional amount of curtailments. Finally, the European grid helped balance those changes with an increase in both energy exports and imports, with some net exporting countries becoming net importers, notably Germany, and vice versa. Together, these findings show the far reaching implications of the COVID-19 crisis, and contribute to the understanding and planning of higher renewables share scenarios, which will become more prevalent in the battle against climate change. • During COVID-19 spread, energy load dropped significantly in most European countries. • Only some restrictions strongly correlate with load drop. • Generation mix and exchange changed in most countries. • The biggest decrease in generation was from nuclear, fossil coal and oil. • Intermittent renewable generation continued to increase also in 2020. [ABSTRACT FROM AUTHOR]